P530

1. CHEMICAL COMPOSITION

„P530“ is a special nonmagnetic, austenitic Mn-Cr-N-steel with a Nickel-content of ≤ 2%.

C Mn Cr Mo N Ni
max. 0,05 18,50 - 20,00 13,00 - 14,00 0,40 - 0,60 0,25 - 0,40 max. 2,00

 

2. MECHANICAL PROPERTIES
Following mechanical properties (tested at room temperature) are achieved by a special cold-working process over the full length of the collar:

TEXT OD KSI N/MM
Yield Strength (min.) 0,2%-offset method: OD less than 4“ 120 ksi 830 N/mm²
  OD 4“ to 91/4“ 110 ksi 760 N/mm²
  OD 91/2“ and larger 100 ksi 690 N/mm²
Tensile Strength OD less than 4“ 130 ksi 900 N/mm²
  OD 4“ and larger 120 ksi 830 N/mm²
Elongation (min.):   25% 25%
Reduction of area (min.):   50% 50%
Impact energy (min.):   90 ft.lb 122 J
Hardness Brinell: (min.):   260-350 HB 260-350 HB

 

3. MAGNETIC PROPERTIES

Relative permeability: ≤ 1,001.

 

4. CORROSION RESISTANCE
• Transgranular SCC: Prevented by special surface treatments (Hammer peening, roller burnishing, shot peening).

• Intergranular SCC: The occurrence of material sensitization is prevented by quenching after warmforging. Each collar is tested according to ASTM A 262, Pract.A and E, last edition.

 

5. NON-DESTRUCTIVE TESTING

• Magnetic inspection: Drill collars are 100% tested by a proprietary probe-testing process using a Förster Magnetomat 1.782. (“Hot Spot“-test). Magnetic permeability of each collar is certified with the printout of probe-testing.

• Ultrasonic inspection: Each collar is ultrasonically inspected over 100% of the volume according to ASTM E 114, last edition as a minimum level.

 

6. GALLING RESISTANCE
„P530“ is due to the chemical composition and the special coldworking process less susceptible to galling than Cr-Ni steels.